纖維長度與纖維數量對纖維強化壓克力暫用固定局部義齒斷折負荷之影響

Effect of fiber length and fiber quantity on the fracture resistance of fiber-reinforced acrylic provisional fixed partial denture

翁崇文(Tsung-Wen Weng)

指導教授 ： 王震乾

高雄醫學大學/口腔醫學院/牙醫學研究所/碩士(2008年)

https://doi.org/10.6832/KMU.2008.00146

摘要

本研究目的在評估纖維長度及纖維數量對長徑距纖維強化壓克力樹脂暫用固定局部義齒斷折負荷之影響。於不銹鋼支台齒上製作105個四單位的甲基丙烯酸甲脂之暫用固定局部義齒以恢復喪失之下顎第二小臼齒及第一大臼齒。六組實驗組（各組樣本數15個）中利用一束或兩束S-玻璃纖維 (FiberKor 2k bundle)和一束E-玻璃纖維（Stick 4k bundle），以4公釐的強化物來加強在橋體間連接體區或者以18公釐的強化物來加強橋體區並延伸到兩側的支台齒。未強化的樣本作為控制組。接受冷熱循環處理(600 × 5℃/55℃, 2 min/cycle)後，樣本利用暫時黏著劑(Temp Bond)固定於不銹鋼支台齒上。利用萬能材料試驗機上一直徑6公釐的鋼球施壓於第一大臼齒中央窩處，記錄樣本之初始斷折負荷和斷裂形式。利用One-way及3-way ANOVA with nested design 統計分析樣本之斷折負荷，Tukey-Kramer method做事後檢定(α=.05)；χ2 test for trend分析斷裂形式。經過強化的實驗組斷折負荷介於634 N (1束4公釐 FibreKor強化)到821N (1束18公釐Stick強化)之間，統計上均顯著高於控制組之斷折負荷（488 N）。纖維長度與纖維數量這兩個變數會顯著地影響強化組的斷折負荷(p值分別為p<.0001, p=0.01)，然而FibreKor and Stick兩種纖維強化物間的強化效果則沒有差別。斷裂形式方面，樣本經強化後斷裂形式明顯改變，由破碎斷裂變成彎曲斷裂或部分斷裂。結論：將玻璃纖維強化物加到長徑距壓克力樹脂固定局部義齒的橋體區可以增加斷折負荷並改變斷裂形式，而強化效力會受到纖維長度與纖維數量所影響。

關鍵字

暫用固定局部義齒 ； 纖維強化 ； 玻璃纖維 ； 纖維數量 ； 纖維長度

並列摘要

The aim of this study was to evaluate the effect of fiber length and fiber quantity on the fracture resistance of long span fiber-reinforced acrylic provisional FPDs. A total of 105 four-unit PMMA FPDs restoring mandibular second premolar and first molar were fabricated on a stainless steel model. Six groups of acrylic specimens (n=15 each group) were reinforced with either 4mm fiber in connector between pontics or 18mm fiber in pontics extended to both side of abutment respectively, using one or two strands of S-glass fiber (FiberKor 2k bundle) or one strand of E-glass fiber (Stick 4k bundle). Unreinforced specimens served as the control. After 600 thermocycles in 2 water baths at 5℃ and 55℃, the specimens were temporarily fixed with a provisional cement (Temp Bond) on the stainless steel abutment. All FPDs were subjected to load with a 6mm steel ball on the middle fossa of first molar pontic by a universal testing machine. The initial fracture resistance and fracture pattern were recorded. The fracture resistances were analyzed using analysis of variance (ANOVA, 1-way, 3-way with nested design) and Tukey-Kramer method (α=.05). The fracture patterns were analyzed using χ2 test for trend. The loads required to fracture the reinforced groups ranged from 634 N (1 strand of 4mm FibreKor) to 821N (1 strand of 18mm Stick), which were statistically significantly higher than unreinforced controls (488 N). The fracture load of reinforced groups were found statistically significantly influenced by length of fiber and quantity of fiber (p<.0001, p=0.01, respectively), whereas no significant difference was indicated between FibreKor and Stick reinforcements. The fracture pattern of reinforced specimens were altered significantly , changing from catastrophic fracture to bended or partial fracture. In conclusion, the addition of glass fibers at pontic area improve the fracture load and fracture pattern of long span acrylic FPDs, and the reinforcing effect was affected by fiber length and fiber quantity.

並列關鍵字

provisional fixed partial denture ； fiber-reinforced ； glass fiber ； fiber quantity ； fiber length

參考文獻

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